condition mean min max ZT0-3 10.622342082500001 9.369563785 11.87512038 ZT4-7 9.69794897375 7.6055096925 11.790388255 ZT8-11 12.60457297 11.138851215 14.070294725 ZT12-15 8.89127652825 7.536666520000001 10.245886536499999 ZT16-19 7.09617844925 6.1028771825 8.089479716 ZT20-23 11.051546985 10.40846072 11.694633249999999