condition mean min max ZT0-3 16.96448 16.96448 16.96448 ZT4-7 17.750152 17.750152 17.750152 ZT8-11 15.083278 15.083278 15.083278 ZT12-15 16.283621 16.283621 16.283621 ZT16-19 14.917194000000002 14.917194000000002 14.917194000000002 ZT20-23 14.3962825 14.3962825 14.3962825