condition mean min max ZT0-3 6.094 6.094 6.094 ZT4-7 3.6493849999999997 3.6493849999999997 3.6493849999999997 ZT8-11 7.418975 7.418975 7.418975 ZT12-15 7.57141 7.57141 7.57141 ZT16-19 11.336649999999999 11.336649999999999 11.336649999999999 ZT20-23 8.36436 8.36436 8.36436