condition mean min max ZT0-3 67.011411885 51.56968174 82.45314203 ZT4-7 49.5250839275 42.81234517 56.237822685 ZT8-11 48.69818922 47.76148516000001 49.63489328 ZT12-15 46.7169384075 44.48805045500001 48.94582636 ZT16-19 60.813563734999995 55.747501055 65.87962641499999 ZT20-23 85.7057593275 81.37384876499999 90.03766989