condition mean min max ZT0-3 10.391312 10.391312 10.391312 ZT4-7 9.4771205 9.4771205 9.4771205 ZT8-11 10.338474999999999 10.338474999999999 10.338474999999999 ZT12-15 9.3961225 9.3961225 9.3961225 ZT16-19 10.9864585 10.9864585 10.9864585 ZT20-23 11.850624 11.850624 11.850624