condition mean min max ZT0-3 38.77578333333333 25.40795 46.29705 ZT4-7 26.6232 26.6232 26.6232 ZT8-11 13.83455 13.83455 13.83455 ZT12-15 10.61754 7.8042300000000004 13.43085 ZT16-19 21.64305 21.64305 21.64305 ZT20-23 38.8517 38.8517 38.8517