condition mean min max ZT0-3 217.93081365 215.2017488 220.65987850000002 ZT4-7 97.65315395750001 93.19390437000001 102.112403545 ZT8-11 70.176940165 69.8171446 70.53673573 ZT12-15 36.9489885225 30.227163595 43.67081345 ZT16-19 42.1450231125 36.664656605000005 47.62538962 ZT20-23 68.5757129175 68.298785095 68.85264074