condition mean min max ZT0-3 253.078211 253.078211 253.078211 ZT4-7 160.7985785 160.7985785 160.7985785 ZT8-11 126.111212 126.111212 126.111212 ZT12-15 135.718425 135.718425 135.718425 ZT16-19 184.1397705 184.1397705 184.1397705 ZT20-23 214.858517 214.858517 214.858517