condition mean min max ZT0-3 8.0055475 7.824675 8.18642 ZT4-7 4.942315 4.942315 4.942315 ZT8-11 6.80936 6.80936 6.80936 ZT12-15 0 0 0 ZT16-19 8.260825 8.260825 8.260825 ZT20-23 9.437954999999999 9.437954999999999 9.437954999999999