condition mean min max ZT0-3 189.467861 189.467861 189.467861 ZT4-7 152.826974 152.826974 152.826974 ZT8-11 129.4264785 129.4264785 129.4264785 ZT12-15 134.9995025 134.9995025 134.9995025 ZT16-19 156.949031 156.949031 156.949031 ZT20-23 145.530284 145.530284 145.530284