condition mean min max ZT0-3 201.257708 201.257708 201.257708 ZT4-7 237.489821 237.489821 237.489821 ZT8-11 286.7431515 286.7431515 286.7431515 ZT12-15 232.006534 232.006534 232.006534 ZT16-19 266.6240385 266.6240385 266.6240385 ZT20-23 238.428378 238.428378 238.428378