condition mean min max ZT0-3 8.350964999999999 8.350964999999999 8.350964999999999 ZT4-7 3.218505 3.218505 3.218505 ZT8-11 5.8761 5.8761 5.8761 ZT12-15 20.4026 20.4026 20.4026 ZT16-19 24.7553 24.7553 24.7553 ZT20-23 11.07825 11.07825 11.07825