condition mean min max ZT0-3 552.3246666666666 552.3246666666666 552.3246666666666 ZT4-7 368.33799999999997 368.33799999999997 368.33799999999997 ZT8-11 236.06509999999997 236.06509999999997 236.06509999999997 ZT12-15 277.498 277.498 277.498 ZT16-19 347.517 347.517 347.517 ZT20-23 458.7 458.7 458.7