condition mean min max ZT0-3 15.32945 15.32945 15.32945 ZT4-7 13.11435 13.11435 13.11435 ZT8-11 11.32575 11.32575 11.32575 ZT12-15 16.1447 16.1447 16.1447 ZT16-19 21.15215 21.15215 21.15215 ZT20-23 19.3659 19.3659 19.3659