condition mean min max ZT0-3 30.1177 30.1177 30.1177 ZT4-7 21.3881 21.3881 21.3881 ZT8-11 19.718600000000002 19.718600000000002 19.718600000000002 ZT12-15 20.04975 20.04975 20.04975 ZT16-19 24.13385 24.13385 24.13385 ZT20-23 31.60175 31.60175 31.60175