condition mean min max ZT0-3 7.81229 7.28773 8.33685 ZT4-7 7.28098 7.28098 7.28098 ZT8-11 6.553545 6.553545 6.553545 ZT12-15 0 0 0 ZT16-19 7.83316 7.83316 7.83316 ZT20-23 8.250454999999999 8.250454999999999 8.250454999999999