condition mean min max ZT0-3 3.0738125 2.82123 3.326395 ZT4-7 6.86262 6.86262 6.86262 ZT8-11 11.07685 11.07685 11.07685 ZT12-15 0 0 0 ZT16-19 7.438435 7.438435 7.438435 ZT20-23 6.3424949999999995 6.3424949999999995 6.3424949999999995