condition mean min max ZT0-3 12.03796382225 10.4714085745 13.60451907 ZT4-7 5.73244045175 5.302117849 6.1627630545 ZT8-11 6.03110607375 5.464522124 6.5976900235 ZT12-15 5.94645283825 5.6452850859999995 6.2476205905 ZT16-19 9.55494677275 7.27774625 11.8321472955 ZT20-23 23.798110215 19.555555915 28.040664515