condition mean min max ZT0-3 42.411529602499996 30.957513145 53.86554606 ZT4-7 7.60563285725 7.1632627294999995 8.048002985 ZT8-11 5.63599676725 4.534355737 6.7376377975 ZT12-15 5.951754352 5.785580663499999 6.1179280405 ZT16-19 6.68880549125 5.809838544 7.5677724385000005 ZT20-23 8.3444359235 8.196106985 8.492764862