condition mean min max ZT0-3 1.69735563975 1.673674685 1.7210365945000001 ZT4-7 1.40867928525 1.1958870505 1.62147152 ZT8-11 1.91414286025 1.5644066954999998 2.263879025 ZT12-15 2.575684505 2.5018714405 2.6494975695000003 ZT16-19 2.5767016125 2.4489146425 2.7044885825000002 ZT20-23 3.8264861995 3.48733907 4.165633329