condition mean min max ZT0-3 177.132527 177.132527 177.132527 ZT4-7 105.121398 105.121398 105.121398 ZT8-11 113.363507 113.363507 113.363507 ZT12-15 115.3901745 115.3901745 115.3901745 ZT16-19 148.00109500000002 148.00109500000002 148.00109500000002 ZT20-23 238.3820725 238.3820725 238.3820725