condition mean min max ZT0-3 11.121504999999999 10.45396 11.78905 ZT4-7 6.069355 6.069355 6.069355 ZT8-11 6.334569999999999 6.334569999999999 6.334569999999999 ZT12-15 0 0 0 ZT16-19 8.801275 8.801275 8.801275 ZT20-23 9.211445 9.211445 9.211445