condition mean min max ZT0-3 11.69885 11.69885 11.69885 ZT4-7 9.52135 9.52135 9.52135 ZT8-11 8.642399999999999 8.642399999999999 8.642399999999999 ZT12-15 7.57675 7.57675 7.57675 ZT16-19 8.997545 8.997545 8.997545 ZT20-23 10.57001 10.57001 10.57001