condition mean min max ZT0-3 171.26888886666666 171.26888886666666 171.26888886666666 ZT4-7 162.90777777666668 162.90777777666668 162.90777777666668 ZT8-11 65.54000001 65.54000001 65.54000001 ZT12-15 120.40111110000001 120.40111110000001 120.40111110000001 ZT16-19 391.3122222 391.3122222 391.3122222 ZT20-23 480.98444443333335 480.98444443333335 480.98444443333335